<?php

/*
 +--------------------------------------------------------------------+
 | CiviCRM version 3.3                                                |
 +--------------------------------------------------------------------+
 | Copyright CiviCRM LLC (c) 2004-2010                                |
 +--------------------------------------------------------------------+
 | This file is a part of CiviCRM.                                    |
 |                                                                    |
 | CiviCRM is free software; you can copy, modify, and distribute it  |
 | under the terms of the GNU Affero General Public License           |
 | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
 |                                                                    |
 | CiviCRM is distributed in the hope that it will be useful, but     |
 | WITHOUT ANY WARRANTY; without even the implied warranty of         |
 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
 | See the GNU Affero General Public License for more details.        |
 |                                                                    |
 | You should have received a copy of the GNU Affero General Public   |
 | License and the CiviCRM Licensing Exception along                  |
 | with this program; if not, contact CiviCRM LLC                     |
 | at info[AT]civicrm[DOT]org. If you have questions about the        |
 | GNU Affero General Public License or the licensing of CiviCRM,     |
 | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
 +--------------------------------------------------------------------+
*/

/**
 *
 * @package CRM
 * @copyright CiviCRM LLC (c) 2004-2010
 * $Id$
 *
 */

class CRM_Utils_Crypt {

    static function encrypt( $string ) {
        if ( empty( $string ) ) {
            return $string;
        }

        if ( function_exists( 'mcrypt_module_open' ) &&
             defined( 'CIVICRM_SITE_KEY' ) ) {
            $td = mcrypt_module_open(MCRYPT_RIJNDAEL_256, '', MCRYPT_MODE_ECB, '');
            $iv = mcrypt_create_iv( 32 );
            $ks = mcrypt_enc_get_key_size($td);
            $key = substr( sha1( CIVICRM_SITE_KEY ), 0, $ks );
            
            mcrypt_generic_init($td, $key, $iv);
            $string = mcrypt_generic($td, $string );
            mcrypt_generic_deinit($td);
            mcrypt_module_close($td);
        }
        return base64_encode( $string );
    }

    static function decrypt( $string ) {
        if ( empty( $string ) ) {
            return $string;
        }

        $string = base64_decode( $string );

        if ( function_exists( 'mcrypt_module_open' ) &&
             defined( 'CIVICRM_SITE_KEY' ) ) {
            $td = mcrypt_module_open(MCRYPT_RIJNDAEL_256, '', MCRYPT_MODE_ECB, '');
            $iv = mcrypt_create_iv( 32 );
            $ks = mcrypt_enc_get_key_size($td);
            $key = substr( sha1( CIVICRM_SITE_KEY ), 0, $ks );
            
            mcrypt_generic_init($td, $key, $iv);
            $string = rtrim( mdecrypt_generic($td, $string ) );
            mcrypt_generic_deinit($td);
            mcrypt_module_close($td);
        }
        
        return $string;
    }

}




